Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related tree frogs in South America
If reinforcement is occurring, what would you expect if you compare the calls of the two species in zones of sympatry versus zones of allopatry? A) Calls would be about the same in both areas.
B) Calls would be more similar in areas of sympatry.
C) Calls would be more different in areas of sympatry.
C
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The presence of both male and female reproductive tissue in the same individual is termed
a. parthenogenesis. b. hermaphroditism. c. ovipary. d. vivipary. e. ovovivipary.
The person known to history as "Typhoid Mary" was identified by public health officials as a source of typhoid fever, although she reported she had never had typhoid fever. Which of the following is the most accurate description of her in this scenario?
A. contact carrier B. human carrier C. reservoir D. both a human carrier and a reservoir E. a reservoir but not a carrier
The main route for transmission of HIV in most parts of the world is through
A. intravenous drug use. B. homosexual sex. C. blood products. D. heterosexual sex. E. blood transfusion.
A red chemical dye known as phenol red changes to yellow when CO2 is present. A small green plant seedling is placed in phenol red and then placed in the dark. Which of the following is most likely to occur?
a. The solution is yellow to begin with, and it will turn red because photosynthesis is occurring. b. The solution is red to begin with, and it will turn yellow because photosynthesis is occurring. c. The solution is yellow to begin with, and it will turn red because respiration is occurring. d. The solution is red to begin with, and it will turn yellow because respiration is occurring. e. The solution is red to begin with, and it stays red as photosynthesis cannot occur in the dark.